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2002 GMC Sierra 2500 HD Reviews and Owner Comments

2002 GMC Sierra 2500 HD owners review and rate their 2002 GMC Sierra 2500 HD.

2002 GMC Sierra 2500 HD (2 Reviews)
Overall
Body, Interior & Misc.
Brakes
Drive Train
Electrical & Lights
Engine
Exhaust & Emissions
Heating & Air Conditioning
Suspension & Steering
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Why did my inside/outside a.c. door quit working. Button dash lights up but door does not move. 2002 GMC Sierra 2500hd duramax

I started to here a pulsation noise behind my glove box area about every 30 seconds. With my hand I reached under and located the noise against the fire wall. I found a damper that was opening and closing back and fourth. Then found out I have a cabin air filter; changed them out with new ones. Thought that would be the problem, but I still have this damper wanting to pulse back and fourth from open to close. I pushed the damper with my hand a few times but it still wants to go from open to close. Is this some sort of a vacuum problem or maybe an electrical signal telling this damper to go back and fourth? I think this is a damper to bring in outside air into the truck cabin.